Even with lots of wonderful beers sampled, the winner was a slam dunk: Dogfish's Burton Baton. From the website:

This is a blended beer that we've been brewing for the past several years and it's recently been gaining in popularity. For Burton Baton we first brew two 'threads' or batches of beer: an English-style Old Ale and an Imperial IPA. After fementating the separate beers in our stainless tanks, the two are transferred and blended together in one of our large oak tanks. Burton Baton sits on the wood for about a month. When enjoying the Burton Baton, you'll find an awesome blend of the citrus notes from Northwestern hops melding with woody, vanilla notes from the oak. The wood also tends to mellow the 10% of the beer - so tread cautiously!